axicon

noun

ax·​i·​con ˈak-sə-ˌkän 

plural axicons

: an object resembling an optical lens with a conical surface that has no definite focal point

On a trip to Russia, Milchberg discovered that scientists there were using an odd, funnel-shaped "axicon" lens that brought laser beams into an elongated, needle-like focus instead of the sharp point that conventional lenses produce.

—Curt Suplee, Washington Post, 11 Sept. 1995

Word History

Etymology

axi- + icon

First Known Use

1954, in the meaning defined above

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